Telephone installation.



H. O. KABITZSCH.v

TELEPHONE INSTALLATION.

APPLIUATION FILED SBPT.11, 1911,

Patented June 25, 1912.

3 SHEETSSHBET 1.

Eyi

COLUMBIA PLANOORAPH C0..W|\5!|INGTON, D. c.

H. O. KABITZSGH. TELEPHONE INSTALLATION. APPLICATION FILED SEPT. 11, 1911.

. Patented me 25, 1912.

3 BEEETS-SHEET 2.

per

Attorney.

COLUMBIA PLANDORAPH C0.,WASHXNCITON, D. c.

H. 0. KABITZSGH.

TELEPHONE INSTALLATION.

APPLICATION TILED SEPT. 11 1911.

1,030,308. Patented June 25, 1912.

3 SHEETS-SHEET a.

Attorne COLUMBIA PLANOGRAPH (20., WASHINGTON, n. c.

nnrrnn sTA'rEs rrgrnnr OFFICE.

HERMANN OSWALD KABITZSGH, OF HAMBURG, GERMANY, ASSIGNOR TO THE FIRM OF GUSTAV A. MEYER-HENNIGER, OF HAMBURG, GERMANY.

TELEPHONE INSTALLATION.

Specification ofLetters Patent.

Patented June 25, 1912.

Application filed September 11, 1911. Serial No. 648,756.

To aZZ whom it may concern: Be it known that I, HERMANN 0SWAL Knnr'rzscn, a subject of the German Emperor, and resident of Hamburg, Germany, have invented certain new and useful Improvements in and Relating to Telephone Installations, of which the following is a specification.

The invention relates to an apparatus for telephone installations in which by means of a keyboard codperating with various resistances at the call station according to the key depressed the number or the like in question is reproduced at the receiving station by causing a voltmeter to oscillate more or less and the invention relates in particular to means and the construction of the device for reproducing at the receiving station the number wanted by the subscriber corresponding to the keys depressed. In accordance with the invention the number wanted is reproduced owing to the fact that the pointer of the voltmeter when oscillating by means of a suitable operating device .such for example as a resilient hook bar or the like displaces or adjusts segmental bars marked with numerals and carried by rotatably mounted yokes or bars in succession according to its oscillation in order to render visible in suitable spy holes or openings of the receiving apparatus the numbers on the segmental bars corresponding to the keys depressed at the call station the operated segmental numeral bars being retained in these positions by means of suitable locking devices until they are released, whereupon they automatically return to their initial position. The calling-up device of the originating or transmitting station and the receiving device of the receiving station or exchange are also provided with means rendering it possible to give to the calling-up subscriber on his notifying his call and before he depresses the keys corresponding to the desired number, a visible sign by actuating an electromagnetprovided at the subscribers station uponthe checking strip of paper of a writing apparatus connected with the calling-up apparatus. This sign or mark is produced by actuating an electromagnet provided at the callers station from the exchange and serves to notify that the desired number can be transmitted and may also serve for showing him after the transmission of the number that the desired connection cannot be established for some reason, or has not been established on the demand of the subscriber. By means of the apparatus by which the caller is notified by the exchange an electromagnet is simultaneously actuated at the receiving station which releases the locking devicefor the segmental numeral bars of the receiving device in order to prepare it for the next caller.

An embodiment of the invention is illustrated by way of example in the accompanying sheets of drawings in which:

Figure 1 is a front elevation partly in section of the call device provided at the subscribers stat-ion. Fig. .2 is a horizontal section on the line CD. Fig. 3 is a vertical section on the line EF in Fig. 1. Fig. 4 is a front elevation of the receiving de vice provided at the receiving station or exchange. Fig. 5 is a rear elevation thereof. Fig. 6 is a section on the line GH in Fig. 41-. Figs. 6 and 6 are detail views to a larger scale of the operating device on the pointer of the voltmeter of the receiving device and Fig. 7 explains the system of connections between the transmitting and receiving devices.

As shown in Figs. 1 to 3 the transmitting or call signal device A consists of a casing 1 in which a spiral wire resistance 2 is arranged. In front of this spiral 2 ten metal contact terminals 3 are arranged at equal intervals (Fig. These metal terminals 3 are secured to resilient upright arms or yokes 4 fixed in the casing 1. By means of the press buttons 5 arranged in corresponding recesses in the front wall of the casing and provided with the serial numbers 1 9, 0 the yokes 4 arranged behind these buttons can be acted upon and the terminals 3 thereby pressed against the resistance spiral 2. Arms 6 are rotatably connected with the resilient yokes 4, the lower ends of type levers 7 7 "being jointed to these arms. A strip of paper 9 runs in front of types, 8 which are conveyed from the delivery roller 10 to the receiving roller 11. An inking ribbon 12 also passes between the strip of paper 9 and the types 8; said ribbon'12. is wound upon two spools 12. Both the inking ribbon and the strip of paper which is visible through a glass plate 1 are fed in the known manner as in writing machines. Behind the strip of paper 9 a horizontal metal pin 13 carried by a resilient arm 14 is arranged; sald arm 14 carries a small armature 15 arranged 1n front of the 1ron core 16 of an electromagnet 17. The current is supplied to this electromagnet through the circuit a in which it is inserted, its circuit being adapted to be closed by a press button d (Fig. 7) of the receiving station or exchange.

The receiving device B provided at the receiving station consists of a casing b with a voltmeter 19 (Figs. 4 to 6) inserted in the line circuit f (Fig. 7) this voltmeter imparts a larger or smaller oscillation to the pointer or index 21 mounted on the shaft 20 according as fewer or more sections of the resistance coil 2 are thrown in the conductor f by depressing the press buttons 01' the call signal device. Immediately behind the pointer 21 a fixed wall 22 is arranged. On the inner side or face of this wall 22 a plate 25 is movably mounted on pin guides 23 against springs 24; this plate is adapted to be displaced on its pin guides on the fixed wall 22 by means of an electromagnet 26 inserted in the circuit a and arranged on the fixed wall 22 and able to act 011 an armature 27 fixed to the movable plate 25. The fixed wall and the displaceable plate are provided with segmental slots 28 and 29 (Fig. 6) running concentrically with the axis 20 of the voltmeter index 21 and approximately registering. The inner edges of the slots 29 are provided with locking teeth 30 (Fig. 5). Five wire yokes or bars. 32 are loosely mounted on a shaft 31 concentrically with the shaft 20 in such a manner that they are able to work on the shaft 31 entirely independently of each other. The free ends of the yokes 32 extend through the slots 29 and 28 and each of them carries a segmental bar 33 on the front side of the wall 22. These bars,

33 which are marked with the numerals 0, 9 1 on their front sides uncover the concentric slots 28 or move when they are swung upward or allowed to drop in the path of these slots; they are guided bet-ween concentric flanges 34 and lower webs 35.

Easily actingpawls 36 are provided on the yokes 32 inside the slots 29 (Fig.5) their center of gravity being located so that the point of the pawl always assumes the correct locking position relatively to the locking teeth 30 of the corresponding slot 29 in each position of the bar 33 and the bar 33 carried upward is thus locked and retained in its upper end position so that it is unable to swing downward or back automatically.

A slide bar '38 subjected to the action of a sensitive spring 37 is arranged on the free end ofthe index 21 of the voltmeter and is provided with a number of hooks 39 corresponding to the number of bars 33. These hooks are bent toward the bars 33 in such a manner that when the index 21 swings upward the hooks engage beneath projecting pins 40 on the bars (which pins can be formed by the ends of the yokes 32) and carry the bars 33 upward when they are retained in the upper end position by the locking pawls 36 when the index 21 again rocks downward. The interval between the hooks 39 is calculated in such a manner that when the pin of the first or innermost bar 33 is seized by the first hook 39 the four other or outer hooks are able to pass freely past the pins 40 of the four outer bars without carrying the latter upward with them. Now

as owing to the first depression of a key on.

the spy holeor inspection opening 41 in the front wall of the casing b, when the energizing of the voltmeter ceases the index 21 falls back into its lower end position. The chamfered front edge 39 of the second hook 39 then encounters the pin 40 of the second bar 33 and in forcing the slide bar 38 outward snaps behind the pin of this second bar 33. Upon the second oscillation of the index of the voltmeter the second bar 33 is moved upward and locked in position whereupon the same operation is repeated until all the bars 33 have been moved upward and adjusted, that is to say, until the number of the subscriber to whom the caller desires to speak, is visible in the inspect-ion apertures 41.

The release of the adjusted numeral bars 33 is effected by closing the circuit a (Fig. 7) by means of the press button (Z at the receiving station. The electromagnet 26 is thereby energized and attracts the armature 27 thus displacing the plate 25 so that the teeth 30 release the pawls 36. The bars 33 which are no longer locked then all slide down into their initial position, the pin 40 the shank of the first hook and forces the slide bar 33 outward to such an extent that the four outer hooks are unable to seize the pin 40. The receiving device is then ready for further use.

The operation of the two devices or ap paratus described above is as follows :-If a subscriber wishes to establish connection with another subscriber he removes the receiver h at his station (Fig. 7 this closes the call signal circuit to f and causes the corresponding white call lamp I at the exchange to glow. If the receiving device B is free the press button (Z is closed for a moment at the exchange thus energizing the electromagnet 17 of the call signal device A and attracting the yoke 14, the metal pin 13 of which produces an impression (a point) on or in the strip of paper 9. This serves as a sign for the calling subscriber to make'the desired call number which he does by depressing the 'keys corresponding to the numerals of this number in succession on the device A whereby the index2l of the voltmeter 19 inserted in the circuit 7 rocks upward and adjusts the numeral bars 33 of the receiving device B in succession beginning from the left hand in correspondence with the switched in sections of the resistance coil of the call signal device A until the desired numerals appear in their proper order in the inspection apertures 11 and when read from left to right give the desired subscribers number. Simultaneously with this depression of the keys after the permissive signal has been given by the exchange the desired number has also been impressedby thetype levers 7 on the strip of paper 9 for checking purposes. If the subscribers number thus rendered visible in the receiving device B should be engaged the press button (I is quickly pressed twice in succession at the exchange thus energizing the electromagnet 17 twice in succession and by means of the pin 13 producing two marks in the displaced paper strip thus notifying the calling subscriber that the desired number is engaged. These two marks also annul or register the call made as void. If the calling subscriber has made a mistake in depressing the keys or in some other way caused an. incorrect number to appear at the receiving device when he notices this mistake and before the conection has been effected by the exchange by immediately hanging up the receiver it he can extinguish the call lamp I atthe exchange and thus notify the exchange that for some reason he does not wishto speak with the subscriber of the number notified. The exchange then by acting twice on the press button (Z returns the receiving device B to its initial position and by simultaneously actuating the electromagnet 17 produces two marks on the strip of paper indicating that the connection previously 'recorded on the strip by one mark was not wished and should not be counted, exactly in' the same manner as when the called number has been engaged. By pressing the press button (Z the electromagnets 17 and 26 are simultaneously energized. This simultaneous energizing of the two electromagnets does not, however, give rise to any misunderstanding or error because the exchange only notifies that the desired number is to be indicated by depressingthe keys when the receiving device is free and consequently an idle actuation of the releasing plate 25 does no harm while on the other hand the trans mission of the permissive signal to the calling subscriber which takes place simultaneously with the release of the plate 25 economizes time as regards the duration of the time for effecting the connection.

A switch 8 inserted in the circuit line f (Fig. 7) enables the receiving device B to be cut out when working is interrupted.

A three-way switch a (Fig. 7) at the callers station in conjunction with the lines so which. The head exchange then calls up the desired station which notifies the calling subscriber this being effected by the subexchange by making a suitable sign on the strip of checking paper 9 (as already described) and by the trunk call ofiice and the inquiry office by making verbal reply.

I claim:

1. In a telephone system a transmit-ting apparatus a receiving apparatus an adjustable resistance a plurality of numbered keys at the transmitting station adapted to vary said resistance a voltmeter in the line circuit a fixed wall and a displacable plate in the receiving apparatus each provided with a plurality ofsegmental slots, a plurality of segmental numeral bars adapted to be successively adjusted in said slots by the successive oscillations of the index of said voltmeter and means for locking said numeral bars in their adjusted position to give visible indication of the number required.

2. In a telephone system a transmitting apparatus a receiving apparatus an adjustable resistance a plurality of numbered keys at the transmitting station adapted to vary said resistance a voltmeter in the line circuit a fixed wall and a displaceable plate in the receiving apparatus each provided with a plurality of segmental slots arranged concentrically with the axis of the voltmeter index, a plurality of rotatable yoke pieces loosely mounted on a shaft concentric with the axis of said voltmeter index and passing through said slots a plurality of segmental numeral bars adapted to be successively ad justed in said slots by the successive oscillations of said voltmeter index and means for locking said numeral bars in their adjusted position to give visible indication of the number required.

In a telephone system a transmitting apparatus a receiving apparatus an adjust-- able resistance a plurality of numbered keys at the transmitting station adapted to vary said resistance a voltmeter in the line circuit a fixed Wall and .a displaceable plate in the receiving apparatus each provided with a plurality of segmental slots arranged concentrically with the axis of the voltmeter index, a plurality of rotatable yoke pieces loosely mounted on a shaft concentric with the axis of said voltmeter index and passing through said slots a resilient hook bar arranged on the free end of said voltmeter index a plurality of segmental numeral bars carried by said yoke pieces and adapted to be successively adjusted in said slots by the successive oscillations of said voltmeter index and means for locking said numeral bars in their adjusted position to give visible indication of the number required.

4C. In a telephone system a transmitting apparatus a receiving apparatus an adjustable resistance a plurality of numbered keys at the transmitting station adapted to vary said resistance a voltmeter in the line circuit a fixed wall and a disp'laceable plate in the receiving apparatus each provided with a plurality of segmental slots arranged concentrically With the axis of the voltmeter index, a plurality of rotatable yoke pieces loosely mounted on a shaft concentric with the axis of said voltmeter index and passing through said slots a resilient hook bar arranged on the free end of said voltmeter index a plurality of segmental numeral bars carried by said yoke pieces and adapted to be successively adjusted in said slots by the successive oscillations of said voltmeter index and means for locking said numeral bars in their adjusted position to give visible indication of the number required and means for releasing said bars.

5. In a telephone system a transmitting apparatus a receiving apparatus and means for giving visible indication at the exchange of the number required and means under the control of the exchange for giving a subscriber a visible signal of permission to notify the number required or a visible sign that the desired connection cannot be made.

6. In a telephone system a transmitting apparatus a receiving apparatus, means for giving visible indication at the exchange of the number required a press button located at the exchange and adapted to close a circuit an electromagnet at the transmitting station adapted to be energized by the operation of said press button and means adapted upon the energizing of said electromagnet to give a subscriber a visible signal of permission to notify the number required or a visible sign that the desired connection cannot be made.

7."In a telephone system a transmitting apparatus areceiving apparatus means for giving visible indication at the exchange of thenumber required a press button located at the exchange and adapted to close a circuit an electromagnet at the transmitting station adapted to be energized by the operation of said press button a pair of spools, a paper strip Winding from one of said spools on the other, a yoke, a metal pin attached to said yoke and adapted upon the energizing of said 'electromagnet to perforate said paper strip and thus give the sub scriber a visible signal of permission to no tify the number required or a visible sign that the desired connection cannot be made.

8. In a telephone system a transmitting apparatus a receiving apparatus an adjustable resistance a plurality of numbered keys at the transmitting station adapted to vary said resistance a voltmeter in the line circuit, a fixed wall and a displaceable plate in the receiving'apparatus each provided with a plurality of segmental slots arranged con centrically with the axis of the voltmeter index, a plurality of rotatable yoke pieces loosely mounted on a shaft concentric with the axis of said voltmeter index and passing through said slots a resilient hook bar arranged on the free end of said voltmeter index a plurality of segmental numeral bars carried by said yoke pieces and adapted to be successively adjusted in said slots by the successive oscillations of said voltmeter index means for locking said numeral bars in their adjusted position to give visible indication of the number required means for releasing said bars a press button located at the exchange and adapted to close a circuit an electromagnet at the transmitting station adapted to be energized by the operation of said press button, a pair of spools, a paper strip winding from one of said spools on the other, a yoke, a metal pin attached to said yoke and adapted upon the energizing of said electromagnet to perforate said paper strip and thus give the subscriber a visible signal of permission to notify the number required or a visible sign that the desired connection cannot be made.

9. In a telephone system a transmitting apparatus a receiving apparatus an adjustable resistance a plurality of numbered keys at the transmitting station adapted to vary said resistance means under the control of said keys for giving visible indication of the number required a paper strip an inking ribbon a resilient yoke arranged behind and adapted to be engaged by each of said keys, lever arms connected with said yokes, type bars connected to said arms and adapted to print upon the paper strip the numbers of the keys operated.

10. In a telephone system a transmitting apparatus a receiving apparatus an adjusable resistance a plurality of numbered keys at the transmitting station adapted to vary said resistance a voltmeter in the line circuit a fixed wall and a displaceable plate in the receiving apparatus each provided with a plurality of segmental slots, a plurality of segmental numeral bars adapted to be successively adjusted in said slot-s by the successive oscillations of the index of said voltmeter and means for locking said numeral bars in their adjusted position to give visible indication of the number required, a paper strip an inking ribbon a resilient yoke arranged behind and adapted to be engaged by each of said keys, lever arms connected with said yokes, type bars connected to said arms and adapted to print upon the paper strip the numbers of the keys operated.

11. In a telephone system a transmitting apparatus a receiving apparatus an adjustable resistance a plurality of numbered keys at the transmitting station adapted to vary said resistance a voltmeter in the line circuit a fixed Wall and a displaceable plate in the receiving apparatus each provided With a plurality of segmental slots arranged concentrically with the axis of the voltmeter index, a plurality of rotatable yoke pieces loosely mounted on a shaft concentric With the axis of said voltmeter index and passing through said slots a resilient hook bar arranged on the free end of said voltmeter index a plurality of segmental numeral bars carried by said yoke pieces and adapted to be successively adjusted in said slots by the successive oscillations of said voltmeter index means for locking said numeral bars in their adjusted position to give visible indication of the number required a paper strip, an inking ribbon a resilient yoke arranged behind and adapted to be engaged by each of said keys, lever arms connected with said yokes, and type bars connected to said arms and adapted to print upon the paper strip the numbers of the keys oper ated.

12. In a telephone system a transmitting apparatus a receiving apparatus means situated at the transmitting station for giving visible indication at the exchange of the number required, means for simultaneously rendering said number visible at the sub scribers station and means under the control of the exchange for giving a subscriber a visible signal of permission to notify the number required or a visible sign that the desired connection cannot be made.

13. In a telephone system a transmitting apparatus a receiving apparatus an adjustable resistance a plurality of numbered keys at the transmitting apparatus adapted to vary said resistance a voltmeter in the line circuit a fixed Wall and a displaceable plate in the receiving apparatus each provided with a plurality of segmental slots, a plurality of segmental numeral bars adapted to be successively adjusted in said slots by the successive oscillations of the index of said voltmeter means for locking said numeral bars in their adjusted position to give visible indication of the number required, a paper strip an inking ribbon a resilient yoke arranged behind and adapted to be engaged by each of said keys, lever arms connected with said yokes, type bars connected to said arms and adapted to print upon the paper strip the numbers of the keys operated, a press button located at the exchange and adapted to close a circuit an electromagnet at the transmitting station adapted to be energized by the opera tion of said press button a pair of spools a paper strip Winding from one of said spools to the other, a yoke, a metal pin attached to said yoke and adapted upon the energizing of said electromagnet to perforate said paper strip and thus give the subscriber a visible signal of permission to notify the number required or a visible sign that the desired connection cannot be made.

HERMANN OSWALD KABITZSCH.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

